40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  ATF eLog, Page 1 of 56  Not logged in ELOG logo
ID Date Author Type Category Subject Text Attachments
  2802   Fri Sep 16 16:29:28 2022 RadhikaDailyProgressCryo vacuum chamberProgress - Heaters, RTDs, Maglite   IMG_3756.jpegIMG_3759.jpeg 
  2801   Fri Sep 9 12:10:29 2022 RadhikaDailyProgressCryo vacuum chamberProgress - Heaters, RTDs, MagliteI acquired internal tooth lock washers
to bolt down the ground wire to the aluminum
maglite body, but I soon recognized that
 IMG_3745.PNG 
  2800   Tue Aug 23 22:23:06 2022 awadeUpdateWOPOInstalling 1811 PDsI recall at one point we had one of these
NF1811 with a broken power suply pin.  It
was from a limited production run with the
  
  2799   Thu Aug 4 10:16:04 2022 RadhikaDailyProgressEmissivity estimationMegastat RTD calibration[Clare, Radhika]

We performed a calibration procedure
on the newly ordered RTDs for Megastat, in
  
  2798   Tue Aug 2 11:37:19 2022 RadhikaDailyProgressCryo vacuum chamberProgress - Heaters, RTDs, Maglite- RTD calibration with Clare scheduled
for Wed 8/3 morning.

- A heater will be bolted down
 IMG_3704.jpeg 
  2797   Fri Jul 29 14:27:43 2022 StephenDailyProgressCryo vacuum chamberProgress - Heaters, RTDs, MagliteUpdate to QIL/2795:


RTDs (Digi-key P/N 615-1123-ND)
brought to lab (see pic).
Heaters
  
  2796   Wed Jul 20 15:55:41 2022 YehonathanUpdateWOPOInstalling 1811 PDs{Yehonathan, Paco}

We comfirmed that the DC ouput
of one of the 1811s is bad. We set out to
 Diabolo_Current_Power_at_PDs.png 
  2795   Mon Jul 18 11:02:50 2022 RadhikaDailyProgressEmissivity estimationPlan for this week[Stephen, Clare, Hiya, Radhika]

We started a cooldown on Thursday
with an undoped Si wafer in Megastat [
  
  2794   Thu Jul 14 18:15:41 2022 RadhikaDailyProgressEmissivity estimationUndoped Si wafer cooldown in Megastat[Stephen, Clare, Hiya, Radhika]

 IMG_3665.jpegIMG_3669.jpegIMG_3673.jpegIMG_3671.jpegIMG_3676.jpeg 
  2793   Tue Jul 5 17:40:14 2022 RadhikaDailyProgressEmissivity estimationGlass wafer cooldown with ceramic ball bearingsThe cryocooler was switched off on Tue
7/5 at 11:45am.
  
  2792   Tue Jul 5 11:58:01 2022 RadhikaDailyProgressEmissivity estimationGlass wafer cooldown with ceramic ball bearings[Radhika, Clare]

On Thursday 6/30 we worked towards
a cooldown with a glass wafer rested
 6x 
  2791   Wed Jun 29 09:39:01 2022 Clare NelleDailyProgressEmissivity testingRTD Calibration Day 2[Radhika, Hiya, and Clare]

We debonded the RTDs from the chamber
using isopropanol and acetone, then soaked
 ice_bath_calibration.xlsx 
  Draft   Mon Jun 27 10:59:04 2022 RadhikaDailyProgressEmissivity estimationSi wafer emissivity testingHere I analyze potential gains from using
LN2 to kick off a Megastat cooldown, and
transition to a cryocooler to cool under
 coldhead_vs_LN2.pdfthermal_transfer_rate_LN2.png 
  Draft   Mon Jun 27 10:56:23 2022 RadhikaDailyProgressEmissivity estimationSi wafer emissivity testingHere I analyze potential gains from using
LN2 to kick off a Megastat cooldown, and
transition to a cryocooler to cool under
  
  2788   Thu Jun 23 11:56:21 2022 JCElectronicsGeneralEquipment[JC, Paco]

I took the Moku and iPad from QIL
over to 40m for PLL Measurement at the 40m.
  
  2787   Tue Jun 21 11:00:57 2022 RadhikaDailyProgressEmissivity estimationThermal conduction through ceramic ball bearingsHere I summarize the analysis of thermal
conduction through 3 ceramic ball bearings
supporting a test wafer in Megastat. I considered
 1-s2.0-S027288421100229X-gr4.jpgthermal_conductance_joints.pngwafer_cooldown_model_ball_bearings.pdf 
  2786   Tue Jun 21 10:35:15 2022 Clare NelleDailyProgressEmissivity estimationRTD Calibration RTD
Calibration Plan Developed on 16-06-2022:



  
  2785   Fri Jun 10 16:23:04 2022 ranaDailyProgressEmissivity estimationMegastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plateFrom the plot, it seems like the slop is
~50 Ohms / 120 K. So a difference of 5 K
corresponds to ~2 Ohms.
  
  2784   Fri Jun 10 09:47:07 2022 RadhikaDailyProgressEmissivity estimationMegastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plateI looked closer at the RTDs, and they are
all PT100s with the same resistance-temperature
curve [Attachment 1]. So we might need to
 hmfile_hash_88f68a98.png 
  2783   Thu Jun 9 10:42:26 2022 RadhikaDailyProgressEmissivity estimationMegastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plateI encountered several puzzles in the
data from this cooldown (Attachment 1):

1. Due to residual challenges with
 MS_cooldown_2022-06-02_data.pdf 
  2782   Thu Jun 9 10:27:01 2022 RadhikaDailyProgress2um PhotodiodesPD testing plan in CAML lab[Aidan, Radhika]

On Tuesday 6/7 we met to discuss
next steps for getting PD testing up and
  
  2781   Wed Jun 8 12:15:06 2022 RadhikaDailyProgressEmissivity estimationMegastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plateThe cryocooler was turned off 6/8 at 11am.   
  2780   Tue Jun 7 11:50:09 2022 RadhikaDailyProgressEmissivity estimationFastest cooldown + power budgets for 2" Si wafer cooldown in MegastatI've modeled the theoretical "best"
achievable configuration in Megastat, replacing
the flexible strap with a solid copper element,
 wafer_cooldown_model_ideal.pdfpower_budget_ideal.pdf 
  2779   Mon Jun 6 14:05:08 2022 AidanElectronicsPurchasesReturn me to WB265B: Location of Thorlabs S130C (silicon photodiode 5mW/500mW settings)[Aidan]

I bought a new photodiode for the
West Bridge Labs. It will be housed in the
 S130C_calibration.pdfIMG_9289.jpgIMG_9287.jpg 
  2778   Mon Jun 6 09:45:58 2022 RadhikaDailyProgressEmissivity estimationMegastat cooldown - repainted inner shield aquadag, added aquadag foil to cold plate[Stephen, Radhika, Hiya]

This entry describes efforts towards
the most recent Megastat cooldown with: 
 6x 
  2777   Thu Jun 2 10:28:26 2022 YehonathanUpdateWOPOInstalling 1811 PDs[Shruti, Yehonathan]

We took newport 1811
PDs, one from CTN lab (suspicious) and one
  
  2776   Tue May 31 17:53:07 2022 ranaDailyProgressEmissivity estimationSi wafer emissivity testingthat's a good start, but we want the
cooldown to be fast, so what we would need
from the model is for you to change some
  
  2775   Fri May 27 17:33:24 2022 RadhikaSummaryEmissivity estimationList of Megastat upgrades for emissivity estimation[Stephen, Radhika]

Today we further discussed ideas
for the enclosure, suspension/support, and
 IMG_3493.jpegIMG_3494.jpegIMG_3492.jpegIMG_1633.jpeg 
  2774   Fri May 27 13:30:21 2022 RadhikaDailyProgressEmissivity estimationSi wafer emissivity testingI modeled the cooldown of a 2" Si
wafer in Megastat with cooling from a) the
existing cryocooler and b) LN2. The
 cryocooler_vs_LN2_wafer.pdf 
  2773   Thu May 26 13:12:25 2022 RadhikaSummaryEmissivity estimationList of Megastat upgrades for emissivity estimationI think this flashlight
would work

  
  2772   Wed May 25 14:32:12 2022 RadhikaSummaryEmissivity estimationList of Megastat upgrades for emissivity estimationThis post will serve as a running list
of modifications for Megastat for emissivity
estimation (brain dump). It is divided into
  
  2771   Fri May 20 11:08:16 2022 RadhikaDailyProgressEmissivity estimationMegastat Inner Shield for emissivity estimationThe results from tapping are in the previous
entry, and it seemed to work well. As for
the emissivity of the inner surface, it would
  
  2770   Wed May 18 21:53:31 2022 ranaDailyProgressEmissivity estimationMegastat Inner Shield for emissivity estimationI'd recommend drilling a through hole
and using a nut, rather than tapping as I
suggested earlier. The shield is not thick
  
  2769   Wed May 18 09:42:34 2022 RadhikaDailyProgressEmissivity estimationMegastat Inner Shield for emissivity estimation[Radhika, JC]

In order to avoid having to order
a new inner shield for emissivity estimation
 9x 
  2768   Fri May 13 09:12:14 2022 RadhikaDailyProgressEmissivity estimationPlan towards MCMC emissivity estimationI've now used the following model of
heat transfer between a suspended Si sample
(1), inner shield (2), and aperture
 e1_eval_uncertainty_TM.pdfe1_eval_uncertainty_wafer.pdfe1_posterior_TM.pdfe1_posterior_wafer.pdf 
  2767   Wed May 11 15:53:06 2022 AidanLab InfrastructureCleanlinessCeiling tile replacement - Day 2Tiles are replaced.




 IMG_8806.jpgIMG_8807.jpgIMG_8803.jpg 
  2766   Tue May 10 14:27:26 2022 AidanLab InfrastructureCleanlinessCeiling tile replacement - Day 1Henry from the Carpentry Shop has started
replacing ceiling tiles. They need to be
cut to fit each location. There was a lot
 IMG_8782.jpg 
  Draft   Mon May 9 09:45:17 2022 StephenDailyProgress2um PhotodiodesRecovery of IR Labs dewar WIP[Jordan, Jancarlo, Stephen, Radhika]

The Helium leak testing setup from
the 40m Bake Lab was transported to WB B265B
  
  2764   Thu Apr 28 14:12:20 2022 YehonathanUpdateWOPOStill figuring out the readout electronics and fixing of some stuff{Shruti, Yehonathan}

We went to the e-shop to investigate
the PD circuits. Completely confused about
 JustTIR.pdfTIR_WithCapacitors.pdfOnlyV_plus.pdf 
  2763   Thu Apr 28 11:39:24 2022 JCElectronicsGeneralNetworkI checked the internet in the TCS/MD Lab
and it is running great and the switch is
runing properly.
 IMG_0671.jpeg 
  2762   Mon Apr 25 11:08:35 2022 YehonathanUpdateWOPOStill figuring out the readout electronics and fixing of some stuff{Shruti, Yehonathan}

We realized that the PD amp circuit
only requires a 5V DC supply so we try that.
  
  2761   Fri Apr 22 13:58:09 2022 RadhikaDailyProgressEmissivity estimationPlan towards MCMC emissivity estimationI've used the following model of heat
transfer between a suspended Si sample (1)
and the inner shield (2) in Megastat:
 e_uncertainty_eIS.pdfe_uncertainty_CpSi.pdf 
  2760   Thu Apr 21 10:33:33 2022 shrutiUpdateWOPOStill figuring out the readout electronics and fixing of some stuff[Yehonathan, Shruti]

 

First we turned on the relevant
  
  2759   Wed Apr 20 00:12:12 2022 YehonathanUpdateWOPOStill figuring out the readout electronics and fixing of some stuff{Yehonathan, Shruti}

1. Grabbed 30Hz-3GHz HP spectrum
analyzer from the Cryolab. Installed it in
 20220419_153109.jpg20220419_164600.jpg20220419_184248.jpg20220419_184233.jpg 
  2758   Wed Apr 20 00:00:39 2022 YehonathanLab InfrastructureGeneralPreparing for planned power outage{Yehonathan, Shruti}

We shut down the workstations and
the FBs by doing 
  
  2757   Mon Apr 18 12:02:36 2022 RadhikaDailyProgressEmissivity estimationPlan towards MCMC emissivity estimationBelow are the outlined steps towards building
an MCMC model for estimating the emissivity
of a surface inside Megastat, and determining
  
  2756   Fri Apr 15 13:30:41 2022 RadhikaDailyProgressCDSCTC100 for Megastat not responding to Telnet[Radhika, Chris, Ian, Paco]

There are two CTC100s in QIL, so
we will use the following nicknames:
  
  2755   Fri Apr 15 11:44:41 2022 RadhikaDailyProgressCryo vacuum chamberCooldown started, two copper bars; manual logging.Since the heater seems to not be functional
once again (displaying N/A and no power output),
I proceeded to turn off the cryocooler so
  
  2754   Mon Apr 11 14:50:45 2022 ranaDailyProgressCryo vacuum chamberSi wafer emissivity testingthat's good. Can you from these models
estimate what the uncertainty will be on
the emissivity? i.e. by MCMC or otherwise
  
  2753   Fri Apr 8 17:34:10 2022 StephenDailyProgressCryo vacuum chamberCooldown started, two copper bars; manual logging.Restart, without vacuum incursion, of cooldown
from QIL/2749.
Hopefully we pull data this time, via manual
  
ELOG V3.1.3-